import java.util.Arrays;
import java.util.Comparator;

class Student implements Comparable<Student>  {
    public String name;
    public int age;
    public int score;

    public Student(String name, int age, int score) {
        this.name = name;
        this.age = age;
        this.score = score;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", score=" + score +
                '}';
    }

     @Override
     public int compareTo(Student o) {
         if(this.age > o.age) {//this表示的是：谁调用这个compareTo这个方法，谁就是this
             //this表示的就是student[0],o表示的就是student[1]
             return 1;
         }else if(this.age < o.age){
             return -1;
         }else {
             return 0;
         }
     }
   /* @Override
    public int compareTo(Student o) {
        if (this.name.compareTo(o.name) > 0) {
            return 1;
        } else if (this.name.compareTo(o.name) < 0) {
            return -1;
        } else {
            return 0;
        }
    }*/
}
class AgeComparator implements Comparator<Student>{
    @Override
    public int compare(Student o1, Student o2) {
        return o1.age - o2.age;
    }
}
class ScoreComparator implements Comparator<Student>{
    @Override
    public int compare(Student o1, Student o2) {
        return o1.score- o2.score;
    }
}
class NameComparator implements Comparator<Student>{
    @Override
    public int compare(Student o1, Student o2) {
        return o1.name.compareTo(o2.name);
    }
}
public class Test{
    public static void main(String[] args) {
        Student[] students = new Student[3];
        students[0] = new Student("zhangsan",10,19);
        students[1] = new Student("lisi",8,78);
        students[2] = new Student("wangwu",15,57);
        //比较器
        AgeComparator ageComparator = new AgeComparator();
        ScoreComparator scoreComparator  = new ScoreComparator();
        NameComparator nameComparator = new NameComparator();

        Arrays.sort(students,ageComparator);
        System.out.println(Arrays.toString(students));

    }
}